<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 步骤条 -->
      <el-steps :active="activeIndex - 0" finish-status="success">
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>

      <!-- 标签页显示区域 -->
      <el-form
        ref="addFormRef"
        :model="addForm"
        :rules="addFormRules"
        label-position="top"
      >
        <el-tabs
          tab-position="left"
          v-model="activeIndex"
          @tab-click="TabClick"
          :before-leave="beforeLeaveTab"
        >
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name" type="text"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类">
              <el-cascader
                v-model="addForm.goods_cat"
                :options="cateList"
                :props="cascaderProp"
                @change="handleChange"
              ></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <el-form-item
              v-for="(item, index) in manyTableData"
              :key="index"
              :label="item.attr_name"
            >
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox
                  :label="param"
                  v-for="(param, index) in item.attr_vals"
                  :key="index"
                  border
                ></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item
              v-for="item in onlyTableData"
              :key="item.attr_id"
              :label="item.attr_name"
            >
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <el-upload
              :action="uploadImgURL"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              :on-success="handSuccess"
              :headers="headerObj"
              list-type="picture"
            >
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <quill-editor v-model="addForm.goods_introduce"></quill-editor> 
            <el-button type="primary" class="addBtn" @click="add">添加商品</el-button> 
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>

    <!-- 预览图片对话框 -->
    <el-dialog
      title="提示"
      :visible.sync="previewDialogVisible"
      width="30%"
    >
      <img :src="previewImgURL" alt="" class="preImg">
    </el-dialog>
  </div>
</template>

<script>
import _ from 'loadsh'
export default {
  data() {
    return {
      activeIndex: '0',
      /* 基本信息表单数据 */
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_number: 0,
        goods_weight: 0,
        goods_cat: [],
        attrs: [],
        pics: [],
        goods_introduce: ''
      },
      /* 基本数据表单验证规则 */
      addFormRules: {
        goods_name: [
          { required: true, message: '请输入商品名称', trigger: 'blur' },
        ],
        goods_price: [
          { required: true, message: '请输入商品价格', trigger: 'blur' },
        ],
        goods_number: [
          { required: true, message: '请输入商品数量', trigger: 'blur' },
        ],
        goods_weight: [
          { required: true, message: '请输入商品重量', trigger: 'blur' },
        ],
      },
      /* 商品分类列表 */
      cateList: [],
      /* 级联选择器参数 */
      cascaderProp: {
        label: 'cat_name',
        value: 'cat_id',
        children: 'children',
        expandTrigger: 'hover',
      },
      /* 动态参数 */
      manyTableData: [],
      /* 静态属性 */
      onlyTableData: [],
      /* 图片上传到服务器的地址 */
      uploadImgURL: 'http://127.0.0.1:8888/api/private/v1/upload',
      /* 上传图片时需携带的token */
      headerObj: {
        Authorization: window.sessionStorage.getItem('token'),
      },
      /* 控制预览图片对话框的隐藏与显示 */
      previewDialogVisible: false,
      previewImgURL: ''
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    /* 获取商品分类数据 */
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败！')
      }
      this.cateList = res.data
    },
    /* 级联选择器选择值改变时会触发此函数 */
    handleChange() {
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
      }
    },
    /* 标签页离开第一个时判断商品分类是否选择 */
    beforeLeaveTab(nextTab, oldTab) {
      if (nextTab !== '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请选择商品分类！')
        return false
      }
    },
    async TabClick() {
      /* 跳转到商品参数标签页 */
      if (this.activeIndex === '1') {
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: { sel: 'many' },
          }
        )
        if (res.meta.status !== 200) {
          return this.$message.error('获取动态参数失败！')
        }
        res.data.forEach((item) => {
          item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        })
        this.manyTableData = res.data
        console.log(res.data)
      }
      /* 跳转到商品属性标签页 */
      if (this.activeIndex === '2') {
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: { sel: 'only' },
          }
        )
        if (res.meta.status !== 200) {
          return this.$message.error('获取静态属性失败！')
        }
        this.onlyTableData = res.data
        console.log(res.data)
      }
    },
    /* 图片上传成功 */
    handSuccess(response) {
      const picObj = {
        pic: response.data.tmp_path,
      }
      this.addForm.pics.push(picObj)
    },
    /* 预览图片 */
    handlePreview(file) {
      console.log(file)
      this.previewImgURL = file.response.data.url
      this.previewDialogVisible = true
    },
    /* 移除图片 */
    handleRemove(file) {
      console.log(file)
      const temp_url = file.response.data.tmp_path
      const picIndex = this.addForm.pics.findIndex((item) => {
        return item.pic == temp_url
      })
      this.addForm.pics.splice(picIndex, 1)
    },
    /* 添加商品 */
    add() {
      this.$refs.addFormRef.validate(async value=>{
        if(!value) {
          return this.$message.error('表单验证失败！')
        }
        const form = _.cloneDeep(this.addForm)
        form.goods_cat = form.goods_cat.join(',')
        /* 处理商品的动态参数和静态属性数据 */
        this.manyTableData.forEach(item=> {
          const info = { 
            attr_id: item.attr_id,
            attr_value: item.attr_vals
          }
          this.addForm.attrs.push(info)
        })
        this.onlyTableData.forEach(item=> {
          const info = { 
            attr_id: item.attr_id,
            attr_value: item.attr_vals
          }
          this.addForm.attrs.push(info)
        })
        form.attrs = this.addForm.attrs

        /* 发起添加商品的数据请求 */
        const {data:res} = await this.$http.post('goods', form)
        console.log(res)
        if(res.meta.status !== 201) {
          return this.$message.error(res.meta.msg)
        }
        
        this.$message.success('添加商品成功！')
        this.$router.push('/goods')
      })
    }
  },
  computed: {
    cateId() {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    },
  },
}
</script>

<style lang="less" scoped>
.el-checkbox {
  margin: 0 10px 0 0 !important;
}
.preImg {
  width: 100%;
}
.addBtn {
  margin-top: 15px;
}
</style>